<template>
  <div class="com-container">
    <div class="com-chart" ref="seller_ref"></div>
  </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
  name: "Seller",
  data() {
    return {
      chartInstance: null,
      allData: null,
      currentPage: 1,
      totalPage: 0,
      timerId: null,
    };
  },
   created() {
    this.$socket.registerCallBack('sellerData', this.getData)
  },
  mounted() {
    this.initChart();
    //this.getData();
     this.$socket.send({
      action: 'getData',
      socketType: 'sellerData',
      chartName: 'seller',
      value: '',
    })
    window.addEventListener('resize',this.screenAdapter)
    //屏幕自适配
    this.screenAdapter()
  },
  destroyed() {
    clearInterval(this.timerId);
    window.removeEventListener('resize',this.screenAdapter)
     this.$socket.unRegisterCallBack('sellerData')
  },
  methods: {
    initChart() {
      this.chartInstance = this.$echarts.init(this.$refs.seller_ref, this.theme);
      //对图表初始化配置的控制
      const initOption = {
         title: {
          text: "▎商家销售统计",
          left: 20,
          top: 20,
        },
        grid: {
          top: "20%",
          left: "3%",
          right: "6%",
          bottom: "3%",
          containLabel: true,
        },
        xAxis: {
          type: "value",
        },
        yAxis: {
          type: "category",
        },
         tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'line',
            z: 0,
            lineStyle: {
              color: '#2D3443',
            }
          }
        },
        series: [
          {
            type: "bar",
            label: {
              show: true,
              position: "right",
              textStyle: {
                color: "white",
              },
            },
            itemStyle: {
              // 指明颜色渐变的方向
              // 指明不同百分比之下颜色的值
              color: new this.$echarts.graphic.LinearGradient(0, 0, 1, 0, [
                // 百分之0状态之下的颜色值
                {
                  offset: 0,
                  color: "#5052EE",
                },
                // 百分之100状态之下的颜色值
                {
                  offset: 1,
                  color: "#AB6EE5",
                },
              ]),
            },
          },
        ],
      }
      this.chartInstance.setOption(initOption)
      //对图表对象进行鼠标事件的监听
      this.chartInstance.on("mousemove", () => {
        clearInterval(this.timerId);
      });
      this.chartInstance.on("mouseout", () => {
        this.startInterval();
      });
    },
     getData(ret) {
      //const { data: ret } = await this.$http.get("seller");
      this.allData = ret;
      //对数据排序
      this.allData.sort((a, b) => {
        return a.value - b.value;
      });
      //每5个元素显示一页
      this.totalPage =
        this.allData.length % 5 === 0 ? this.allData.length / 5 : this.allData.length / 5 + 1;
      this.updateChart();
      this.startInterval();
    },
    updateChart() {
      const start = (this.currentPage - 1) * 5;
      const end = this.currentPage * 5;
      const showData = this.allData.slice(start, end);
      const sellerNames = showData.map((item) => {
        return item.name;
      });
      const sellerValues = showData.map((item) => {
        return item.value;
      });
      const dataOption = {
        yAxis: {
          data: sellerNames,
        },
        series: [
          {
            data: sellerValues,
          },
        ],
      };
      this.chartInstance.setOption(dataOption);
    },
      startInterval () {
      if (this.timerId) {
        clearInterval(this.timerId)
      }
      this.timerId = setInterval(() => {
        this.currentPage++
        if (this.currentPage > this.totalPage) {
          this.currentPage = 1
        }
        this.updateChart()
      }, 3000)
    },
    screenAdapter(){
      const titleFontSize = this.$refs.seller_ref.offsetWidth / 100 * 3.6
      const adapterOption = {
        title: { 
          textStyle: {
            fontSize: titleFontSize,
          }
        },
         tooltip: {
          axisPointer: {
            lineStyle: {
              width:titleFontSize
            }
          }
        },
        series: [
          {
            barWidth:titleFontSize,
            itemStyle: {
                barBorderRadius:[0,titleFontSize/2,titleFontSize/2,0],
            },
          },
        ],

      }
      this.chartInstance.setOption(adapterOption)
      this.chartInstance.resize()
    }
  },
    computed: {
    ...mapState(['theme'])
  },
  watch: {
    theme () {
      console.log('主题切换了')
      this.chartInstance.dispose() // 销毁当前的图表
      this.initChart() // 重新以最新的主题名称初始化图表对象
      this.screenAdapter() // 完成屏幕的适配
      this.updateChart() // 更新图表的展示
    }
  }
};
</script>

<style scoped>
</style>